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#1 2008-02-27 11:29 pm
"Unable To Fork" under heavy traffic
I'm running a fast G4 tower with 10.5.2 Server.
It runs apache. There are times when it's under a particularly heavy web load, and I get Unable to Fork errors when PHP is supposed to launch other programs etc. Thing is, this heavy load I'm talking about it based on traffic not CPU. The CPU rarely ever even gets to 50%. When I look at Activity Monitor, I have an absolute smurf LOAD of apache processes. Clearly I'm hitting a limit on either the total number of processors, or the total number of processors per user. SoooOOOOooo I need to know how to increase this limit, so my server can handle much greater surges of traffic. And maybe I should make a few fine-tunings to apache too? In server admin, the overall connection timeout is set to 300 seconds. Thats going to leave processes around for quite a while, no?
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#2 2008-02-28 8:33 am
Re: "Unable To Fork" under heavy traffic
Look into your httpd.conf's MaxClienst, MinSpareServers and MaxSpareServers settings.
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#3 2008-02-28 1:35 pm
Re: "Unable To Fork" under heavy traffic
No no this goes well beyond that. The httpd processes are getting spawned, the problem is apache is hitting a system limit that won't let any more processes get spawned. I believe this limit is 500, and I think I had to change it in two different places to move it up to 1000 on a previous machine once.
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